<template>
    <div class="myView">
        <!-- 固定页面顶部 -->
        <mt-header fixed title="Vue项目" class="head">
            <span slot="left">
            <mt-button icon="back" @click="goBack" v-show="flag">返回</mt-button>
            </span>
        </mt-header>
        <h3>
            <transition>
				<router-view></router-view>
			</transition>
        </h3>
        <!-- 页面底部 -->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="my-tab-item" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="my-tab-item" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="my-tab-item" to="/shop">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart "><span class="mui-badge" id="badge">{{totalcount}}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="my-tab-item" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>
</template>

<script>
import {mapGetters} from 'vuex'
export default {
    data(){
		return{
			flag: true // 默认显示返回按钮
		}
	},
	methods: {
		goBack(){
			// 点击返回按钮，向后跳转
			this.$router.go(-1)
		}
	},
	created() {
		if(this.$router.path === "/home"){
			this.flag = false
		} else if(this.$router.path === "/shop"){
			this.flag = false
		}else if(this.$router.path === "/member"){
			this.flag = false
		}else if(this.$router.path === "/search"){
			this.flag = false
		}
		else{
			this.flag = true
		}
	},
	watch: {
		// 当页面刷新的时候，不会触发watch中监听的路由地址的变化
		"$route.path":function(newVal,oldVal){
			if(newVal === "/home"){
				this.flag = false
			}else if(newVal === "/search"){
				this.flag = false
		    }else if(newVal === "/member"){
				this.flag = false
		    }else if(newVal === "/shop"){
				this.flag = false
		    }    
			else{
				this.flag = true
			}
		}
	},
	computed: {
		...mapGetters(["totalcount"])
	}
}
</script>

<style lang="scss" scoped>
	.myView{
		padding-top: 40px;
		overflow: hidden;
	}

	// 设置路由切换效果
	.v-enter {
		opacity: 0;
		transform: translateX(100%);
	}
	.v-leave-to {
		opacity: 0;
		transform: translateX(-100%);
		position: absolute;
	}
	.v-enter-active,
	.v-leave-active{
		opacity: 1;
		transition: all 0.5s ease;
	}
	.head{
		z-index: 999;
	}
	.mui-bar-tab .my-tab-item.mui-active {
        color: #007aff;  
    }
	.mui-bar-tab .my-tab-item {
		display: table-cell;
		overflow: hidden;
		width: 1%;
		height: 50px;
		text-align: center;
		vertical-align: middle;
		white-space: nowrap;
		text-overflow: ellipsis;
		color: #929292;
    }
	.mui-bar-tab .my-tab-item .mui-icon {
		top: 3px;
		width: 24px;
		height: 24px;
		padding-top: 0;
		padding-bottom: 0;
	}
	.mui-bar-tab .my-tab-item .mui-icon ~ .mui-tab-label {
		font-size: 11px;
		display: block;
		overflow: hidden;
		text-overflow: ellipsis;
	}
</style>